Had successful morgagni-hernia surgery. part of colon was in my right-chest. seroma formed after. now i have chronic nausea, regurgitation, gerd. why?

Post surgery: Although you considered the surgery successful, it appears that your symptoms, if they weren't present posoperatively, are related to some degree of diaphragm laxity allowing reflux and regurgitation. I feel that collaboration between the surgeon and a gastroenterologist will be required to figure out the cause of your symptoms and a treatment plan.